From: David Vernet <void@manifault.com>
To: Tejun Heo <tj@kernel.org>
Cc: kernel-team@meta.com, linux-kernel@vger.kernel.org, sched-ext@meta.com
Subject: Re: [PATCH 5/5] sched_ext: Use shorter slice while bypassing
Date: Thu, 26 Sep 2024 17:07:21 -0500 [thread overview]
Message-ID: <20240926220721.GG26346@maniforge> (raw)
In-Reply-To: <20240925000622.1972325-6-tj@kernel.org>
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On Tue, Sep 24, 2024 at 02:06:07PM -1000, Tejun Heo wrote:
Hi Tejun,
> While bypassing, tasks are scheduled in FIFO order which favors tasks that
> hog CPUs. This can slow down e.g. unloading of the BPF scheduler. While
> bypassing, guaranteeing timely forward progress is the main goal. There's no
> point in giving long slices. Shorten the time slice used while bypassing
> from 20ms to 5ms.
My vote would be to just update SCX_SLICE_DFL to be 5ms, but this is fine as
well if you'd prefer to leave the default slice as something that observably
works well for throughput in fair schedulers.
Acked-by: David Vernet <void@manifault.com>
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next prev parent reply other threads:[~2024-09-26 22:07 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-25 0:06 [PATCHSET sched_ext/for-6.12-fixes] sched_ext: Split %SCX_DSQ_GLOBAL per-node Tejun Heo
2024-09-25 0:06 ` [PATCH 1/5] scx_flatcg: Use a user DSQ for fallback instead of SCX_DSQ_GLOBAL Tejun Heo
2024-09-25 16:45 ` David Vernet
2024-09-25 0:06 ` [PATCH 2/5] sched_ext: Allow only user DSQs for scx_bpf_consume(), scx_bpf_dsq_nr_queued() and bpf_iter_scx_dsq_new() Tejun Heo
2024-09-25 17:09 ` David Vernet
2024-09-25 21:04 ` Tejun Heo
2024-09-26 21:36 ` David Vernet
2024-09-25 0:06 ` [PATCH 3/5] sched_ext: Relocate find_user_dsq() Tejun Heo
2024-09-26 21:46 ` David Vernet
2024-09-25 0:06 ` [PATCH 4/5] sched_ext: Split the global DSQ per NUMA node Tejun Heo
2024-09-26 21:56 ` David Vernet
2024-09-25 0:06 ` [PATCH 5/5] sched_ext: Use shorter slice while bypassing Tejun Heo
2024-09-26 22:07 ` David Vernet [this message]
2024-09-26 22:55 ` Tejun Heo
2024-09-26 23:00 ` [PATCHSET sched_ext/for-6.12-fixes] sched_ext: Split %SCX_DSQ_GLOBAL per-node Tejun Heo
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